Display screen with a transitional graphical user interface



FIG. 1 is a front view showing a first image of a display screen with a transitional graphical user interface showing our new design;

FIG. 2 is a front view showing a second image thereof;

FIG. 3 is a front view showing a third image thereof;

FIG. 4 is a front view showing a fourth image thereof;

FIG. 5 is a front view showing a fifth image thereof;

FIG. 6 is a front view showing a sixth image thereof; and,

FIG. 7 is a front view showing a seventh image thereof.

The broken lines shown in the figures depict portions of the display screen with a graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen with a transitional graphical user interface, as shown and described. 